Improve gallery

app/src/main/java/com/hippo/drawable/BatteryDrawable.java

@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2014 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.drawable;
+
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+
+import com.hippo.yorozuya.MathUtils;
+
+public class BatteryDrawable extends Drawable {
+
+    @SuppressWarnings("unused")
+    private static final String TAG = BatteryDrawable.class.getSimpleName();
+
+    public static final int WARN_LIMIT = 15;
+
+    private int mColor = Color.WHITE;
+    private int mWarningColor = Color.RED;
+    private int mElect = -1;
+    private final Paint mPaint;
+
+    private final Rect mTopRect;
+    private final Rect mBottomRect;
+    private final Rect mRightRect;
+    private final Rect mHeadRect;
+    private final Rect mElectRect;
+    private int mStart;
+    private int mStop;
+
+    public BatteryDrawable() {
+        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
+        mPaint.setStyle(Paint.Style.FILL);
+
+        mTopRect = new Rect();
+        mBottomRect = new Rect();
+        mRightRect = new Rect();
+        mHeadRect = new Rect();
+        mElectRect = new Rect();
+        updatePaint();
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        int width = bounds.width();
+        int height = bounds.height();
+        int strokeWidth = (int) (Math.sqrt(width * width + height * height) * 0.06f);
+        int turn1 = width * 6 / 7;
+        int turn2 = height / 3;
+        int secBottom = height - strokeWidth;
+        mStart = strokeWidth;
+        mStop = turn1 - strokeWidth;
+
+        mTopRect.set(0, 0, turn1, strokeWidth);
+        mBottomRect.set(0, secBottom, turn1, height);
+        mRightRect.set(turn1 - strokeWidth, strokeWidth, turn1, secBottom);
+        mHeadRect.set(turn1, turn2, width, height - turn2);
+        mElectRect.set(0, strokeWidth, mStop, secBottom);
+    }
+
+    /**
+     * How to draw:<br>
+     * |------------------------------|<br>
+     * |\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\|<br>
+     * |------------------------------|---|<br>
+     * |/////////////////|         |//|\\\|<br>
+     * |/////////////////|         |//|\\\|<br>
+     * |------------------------------|---|<br>
+     * |\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\|<br>
+     * |------------------------------|
+     */
+    @Override
+    public void draw(Canvas canvas) {
+        if (mElect == -1)
+            return;
+
+        mElectRect.right = MathUtils.lerp(mStart, mStop, mElect / 100.0f);
+
+        canvas.drawRect(mTopRect, mPaint);
+        canvas.drawRect(mBottomRect, mPaint);
+        canvas.drawRect(mRightRect, mPaint);
+        canvas.drawRect(mHeadRect, mPaint);
+        canvas.drawRect(mElectRect, mPaint);
+    }
+
+    private boolean isWarn() {
+        return mElect <= WARN_LIMIT;
+    }
+
+    public void setColor(int color) {
+        if (mColor == color) {
+            return;
+        }
+
+        mColor = color;
+        if (!isWarn()) {
+            mPaint.setColor(mColor);
+            invalidateSelf();
+        }
+    }
+
+    public void setWarningColor(int color) {
+        if (mWarningColor == color) {
+            return;
+        }
+
+        mWarningColor = color;
+        if (isWarn()) {
+            mPaint.setColor(mWarningColor);
+            invalidateSelf();
+        }
+    }
+
+    public void setElect(int elect) {
+        if (mElect == elect) {
+            return;
+        }
+
+        mElect = elect;
+        updatePaint();
+    }
+
+    public void setElect(int elect, boolean warn) {
+        if (mElect == elect) {
+            return;
+        }
+
+        mElect = elect;
+        updatePaint(warn);
+    }
+
+    private void updatePaint() {
+        updatePaint(isWarn());
+    }
+
+    private void updatePaint(boolean warn) {
+        if (warn)
+            mPaint.setColor(mWarningColor);
+        else
+            mPaint.setColor(mColor);
+        invalidateSelf();
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        // Empty
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter cf) {
+        // Empty
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.TRANSLUCENT;
+    }
+}